I have a question on SO that has no useful answer. As I changed my application distribution, that question is not so important to me anymore. As I see it, I have the following possibilities to deal with that question

Delete it: As I think that question could (if answered) be helpful to others, that is not an option for me.

Set a bounty: I don't want to set a bounty as it is not so important to me anymore.

Answer it myself: I could give an answer explaining what I did to prevent the neccessity to solve this and then accept that answer. I don't think that this answer would really be valid because it doesn't tell how to do what the question asks, but how to prevent it.

Leave it open: And hope that there will be an answer one day. Unfortunately, this will change my % of answered questions, so I don't like that option. Additionally, I think there are already enough unanswered questions messing up SO, so I don't want to add another one to that pile...

@brimborium: Questions without accepted answers do not harm the site. The database does not unravel or summon Cthulhu or whatever if too many questions don't have accepted answers. As for "I like my stats to be clean", there's nothing "clean" about what you're trying to do. Not accepting an answer on a question is not, in and of itself, a bad thing.
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Nicol BolasAug 22 '12 at 12:42

Hm, ok. Thanks for your answer. I guess leaving it open is the best option here.
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brimboriumAug 22 '12 at 12:48

You are right, but I can vote for deletion. For the bounty: I don't care about the rep, but I think the chances are slim that it produces a good answer. Actually, I could just try it and not give the bounty if there is no useful answer...
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brimboriumAug 22 '12 at 12:58

Oh and btw: I am not concerned about what costs me more, but more like what helps SO more... ;)
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brimboriumAug 22 '12 at 12:59

Even if you want to delete it,you cannot as it contain an answer.(Only mods can do it) Wrong, he can delete it as the answer is zero scored. That would be uncool :/ Why? It's perfectly fine and even encouraged to answer your own question if you have a good answer for it.
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YannisAug 22 '12 at 13:41

@YannisRizos I didn't see whether it is upvoted or not. my mistake. But what's with your opinion about answering our own questions and accepting it? Suppose i asked a question and answered it myself and accepted it(if there is a chance). i'll gain reputation like this. Wouldn't it be uncool? This would be a lame trick
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Bhuvan Rikka 웃Aug 22 '12 at 13:55

@YannisRizos If a user continues to do so, without an actual intention to ask a question but to gain reputation by accepting his own questions then wouldn't it come under voting fraud?
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Bhuvan Rikka 웃Aug 22 '12 at 14:16

@BhuvanRikka Forgot to mention that earlier: You don't earn any reputation when you accept your own answer, that only happens when others accept your answer. There's no fraud, if your answer is actually good and others upvote it, the reputation you earn is fair, same as with any good answer.
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YannisAug 22 '12 at 14:20